Ideal Weight Calculator
Estimate a healthy target weight range using three trusted medical formulas.
How This Is Calculated
This tool averages three well-established formulas developed for clinical dosing and nutrition planning:
| Devine Formula | 1974 |
| Robinson Formula | 1983 |
| Miller Formula | 1983 |
These are population averages, not diagnoses. Muscle mass, frame size, and individual health goals all affect what's "ideal" for you — talk to a healthcare provider for personalised guidance.
What "Ideal Weight" Means Here
These formulas were originally developed for clinical use (like calculating medication dosages) and later adopted more broadly as general weight reference points. They estimate a population-average healthy weight based on height and gender — not a personalised target that accounts for your individual muscle mass, frame, or health goals.
How Each Formula Works
The Robinson (1983) and Miller (1983) formulas use similar logic with slightly different constants, refining Devine's original 1974 formula. This calculator averages all three for a broader estimate range.
Why the Result Is a Range, Not One Number
No single formula is "correct" for every body type. Averaging three established formulas and presenting a range better reflects the genuine uncertainty in any height-based weight estimate — especially compared to more direct measures like our Body Fat Calculator.
Frequently Asked Questions
Why do the three formulas give different numbers?
Each was developed independently using different reference populations and constants. Averaging them smooths out individual formula bias and gives a more balanced estimate.
Is this the same as a healthy BMI weight?
They're related but not identical — BMI uses a fixed range across all heights, while these formulas calculate a specific target weight for your exact height.
Should athletes use this calculator?
These formulas don't account for muscle mass, so muscular individuals may find their ideal weight underestimated. Consider it alongside body composition tools like our Body Fat Calculator.